repairing small dents in stainless steel refrigerator door?

Each type of metal, therefore sheet metal, has it's own peculiarities. Stainless has a uniqueness like no other sheet metal. You probably will not be able to completely remove any dents in a S.S. piece of sheet metal but there are ways to make the dents smaller. One of the best tricks is to warm the dented area up with something like a hair dryer, set on high. As warm to the touch as you can get it. Then--shoot something cold on the dent like automotive freon (I know it's not environmentally cool to do this), or use a can of "air" such as you use on a computer keyboard that has been in the fridge for a few hours. You may be able to rub dry ice on the spot, I've not tried that one, but it would be cold. The purpose is to warm the metal to obtain some flexibility, then introduce the cold atmosphere to shrink the metal just a bit. I have used this on auto sheet metal with good success. This is not fool proof, but works most of the time.